Question

【题目】Traffic accidents have caused many deaths in the past few years. more action is taken,the problem will get even worse.
A.Unless
B.If
C.After
D.When

Answer 1

【答案】A
【解析】句意：在过去的几年中，交通事故已经导致了许多人死亡。除非采取措施，这个问题将变得更糟。unless“除非”；if“如果”；after“在……之后”；when“当…..时候”；结合句意，表示不采取行动，问题会更严重，故用连词unless，故选A。